I'm not 100% sure what the difference is as I've never seen the proper insertion tool but I think there is some sort of tapered edge plate that bolts onto the end of the crankshaft. When the seal is being pushed in it opens up and slides smoothly over the taper and onto the crank without catching an edge and damaging the seal. It also seems to have a bell housing which contains the whole thing and guides it in. If anyone can post some decent pictures of one I might have a go at doing something similar.
I asked about borrowing one but they refused as a matter of policy - can't blame them really. I googled the tool part number (9997174) and the only thing I came up with was in America and it was for a Landrover would you believe - exactly the same tool!!
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